Child-proof lock system



FIG. 1 is a perspective view of a child-proof lock system showing my newdesign, shown in the environmental use;

FIG. 2 is a perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a right side elevational view thereof; and,

FIG. 9 is an exploded perspective view thereof.

The broken lines showing of the handles of a refrigerator is forillustrative purpose only and forms no part of the claimed design.

The ornamental design for a child-proof lock system, as shown anddescribed.